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19-Tanzanite

## Solve, Matrix [3x3] ?

Hi, Everyone.
From the following:

How to solve, the Matrix [3x3] ?

Best Regards.
Loi.

1 ACCEPTED SOLUTION

Accepted Solutions
19-Tanzanite
(To:Werner_E)

Just changing "solve, a, b, c" into "solve, b, c, a"

7 REPLIES 7
24-Ruby V
(To:lvl107)

Why not simply use the built-in symbolics?

With this approach the four solutions depend on Z.

But you may as well make the solution(s) dependent on, lets say, Y:

19-Tanzanite
(To:Werner_E)

@Werner_E wrote:

Why not simply use the built-in symbolics?

24-Ruby V
(To:lvl107)

You got a set of seven solution triples.

If there are more dependent on one (or even more) parameters, you may get them by using the modifier "fully" as you can see in my sheet and screenshot.

It looks like Mathcad also delivers three "solutions" which simply are wrong!

We don't see the symbolic solution because its too large to display, but we can assume it contains a parameter "-z" and assign the result to a function.

The first four solutions are always the same and independent on _z, the last three solutions simply are wrong 😞

BTW, Prime6 with the new symbolic engine simply throws a "No solution was found."

19-Tanzanite
(To:Werner_E)

Just changing "solve, a, b, c" into "solve, b, c, a"

23-Emerald III
(To:lvl107)

In case Z=(sqrt(5)-1)/4, you get:

The solution you're after is on the 4th row, when you realise that:

Success!
Luc

19-Tanzanite
(To:LucMeekes)

Many thanks, Luc. I guess you using Mathcad 11. Try with second example and check it out there can eliminate Werner's last 3 solutions. And my Mathcad 15 then:

( 5 minutes waiting but get no result. )

Regards.

Loi.

24-Ruby V
(To:lvl107)

You deleted the constraint "assume, ALL=real" and as it seems Mathcad has a hard time to do the necessary case distinctions as it also tries to consider the case that some or all parameters are non-real.